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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed67002c0ddc452885da308e6b61b30813281bde2d22f332831a8ade695b1c98' 
  AND token = 'MDq0J7JNakXqXRMhUdMBvXYmCOQOLlnM81B6d0qSo+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00222

JSON explain

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