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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55922783df25058c1809922fc3870f9bddc4b24490d21b9e37db9d2de5971d46' 
  AND token = '+GfbnfPNEpYlE3ENiL0oME6gicrcGv7R1678COCvO98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}