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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b046aecb4fc88e350c42eb9c60d657f51618254a384e45df6fc9d7e1952a55' 
  AND token = 'Zu+CL3KjiG44AnDu/enK/7Tb7+uJ1m8l/jNFCK7KwE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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