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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bab5285f1201ff6620c94fba803477cb4aa5f5b507bab51890e18c35cc48ae' 
  AND token = 'vGNb2E6fdQ0AhrCLnifEINeBwdpcqYWE2L3PDGxWqSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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