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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8cc6470756e2e05ad1cb1ee8a03938ffe1ff1a9cb75a0feb31fdb4c15b5c0f' 
  AND token = 'RBifU3ouWqzEO3SCW0JYUH3GYs95cFHvFAwETPO6LMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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