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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d7fadb26eb7fa5a4391cc27197c5c4917acd139483c6f0b5019648d7f25720' 
  AND token = 'CaAovrzTp22mexMVhvmrI0AI4tqw4dBHy3GEsNCVIMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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