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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b931a033423f805e58d43d142a23b73e88df1f55f8ed00d2b5e35dc53c0013' 
  AND token = 'yh1J3KcIAmZRqn0FiAbrExmskv8piWBKCwK4Bcdfq9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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