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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26d784c884c88085a38dede4f8fb2ccfe669d239bf5d9ec8b4a01826e38c6e2' 
  AND token = 'aQX+xc5Ea2y/6yXcSE13tDB+ESFJiHPi4vWKp/Lth/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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