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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8085f40a80e3624d10a136e0953f285f100de4737f0d7fb88445a1a5c936bd9a' 
  AND token = 'Ebp4bn4GtKQjDmMG9p0hSBPESZwUBV0ofec6gCvlM+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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