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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7a675101432aba96cab474a5b8533fb029de6755ea31a86e5865bc081656ee' 
  AND token = 'bL0fFT5A0ylVjrJpPR/WgCjJMJOqIFS9MJsOBzoHZD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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