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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebde109ebda3a455a90803ae1afa6bd1567e52cb08c33db9a0333992dd35fb8' 
  AND token = '9jNKZKeB5GIxvXIQZtSTSfTbCB6mvn+jXtJSbFizSpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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