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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30743317c49d84cddf57f3dc04e12f6dc15adaedf85cac2362a53d6cf8094fb' 
  AND token = '4/H8NBI/LsAw65SYtyGDmtAHdVhC/bJ0h7GQW7OuKe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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