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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4600abb0c95fc6f6c187c5db7c098bffdb7c66ebe2fb22719dcdc18ac74c3c12' 
  AND token = 'qsvIjk5KD4xr0dyDeLZBENlFXpZUq1O2SkN7Di3G5+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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