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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dac6321acc3e2b3ade0b9dd7a58c0e1cf24310ddf4a999146af3b8ab4f6bc59' 
  AND token = 'ceh1ZBZE88n3c9e2OmMn6kySx8YcgYEpUOuquSB8Nwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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