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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2fffde6cf84a7af0a595f81c3b5139c3ff2d485eed9cd7977e0aeb3829d09e' 
  AND token = 'CCAgdy227Sb+BmjJ3rqA6v2cmuni46117JJrcEwrwhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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