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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e0e191e99c920363a2600466185b0cc2b144a335991ae10af05cafc703f284' 
  AND token = 'UOJ3sRYL5KwmvwIgP0WgI/IykdnNCxN+RjexTlxr7JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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