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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1715f2be7c88d04036bcdef7760b89cf62b8d911fc48dfa961bfa2ae9e213906' 
  AND token = 'OMgtRY5Qff3d1Wnns1u4L9E2BJD1U0pNVV1EpUKwrMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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