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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a851a2ab345962d6a46c5ed974d26274191f569a7ad34d2e1aaf981e6f386e3a' 
  AND token = 'jWDc+w+bkwUTKNnSFibfMo3foYnMG1s9K0DmFZhkOK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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