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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd3260b9e2ad49a77447de05c37e72e1967589bb62e72e6d50582165005baf1' 
  AND token = 'pfxt8E3hJR8oogt2hQ4wd3rLImAyJ5aJDnZXrAt5uG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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