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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ef2e95b33bdf35f5c0b33e6331f045d005d021847c5f0c42358e63b20b3e27' 
  AND token = '9f/06P9Kl1QAum4J4KRU1dolXwvqbN/kwrl/93DAGmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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