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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1726662562437b0b71d8cde3932734e8e4b45e2b26488bca2bf60a1bdca1b0' 
  AND token = 'FcJxxyKgLwyaqD6xyam7f8Rf9/OVWibeJu5fzeqtD2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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