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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4063b7ce7d28640e328e42ce42d00930caaf630165607cc5d2f9d84ac77b175b' 
  AND token = 'OFYln07tsm2Iz0/ufEnNACfC+VbTfjj0BN0F51/N5c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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