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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea4663a94b1c888b39a085a31382dad068e3275fcc0335a13d6782adc76afce' 
  AND token = 'FMR8S5J3GpMl75PZsWO0SOYtE/OqRzGFjd+5tKiLAX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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