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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914ecee9f21ea485c338f62858bee7f7e4af198c48063b23ecd2609eea9542f1' 
  AND token = 'ZZ4iJ5gjYzyKf3wKwZ22q0SOl9JdaSSS7dky7BLBeNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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