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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f127e6f5b899d1f0e2913a16f2f39514eacaa7dee7dd19ace3ee6aeba40da7a6' 
  AND token = 'BXDh3p3sT+ZdJz3rDvdCv+s8/i4Oi+ht1qvRjT+rPMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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