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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3084bfec62f25ac915790ff30a3718dcf7d4cba4f693c38452538a8dd6541a8' 
  AND token = 'tlk0xe2bH8EjG5k8GPjslmDPsQs6lN0sKbJHhtdGMyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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