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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f3cc52ca690bb94f78917aa5f4a40cd3f5f4cfbf5a5ee426275bfff1788277' 
  AND token = 'CP9raVGkxIZjDITQumrIleouCi/gLeJ6+RFnNPGJfuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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