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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ac0ca2865469ea29fa916a5ad6481fc7f4412c9579791fc7a4674743c7c0ae' 
  AND token = 'la+aNDZ7cBg7VFo87ufL+H3CAAmoWAwe2rPa46ColxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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