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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90bdf80f85ca9dc463fa4808fbfa08370b936603cd68634e7982877d86b2430' 
  AND token = 'ePnK8j9ptU0wjP+8Jg4JIub89NVJU8KosKf+U+bouog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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