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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2627390ef5c3817c60a8dbe502f4cbd501d62d0de22ddf376239f5c16012fca2' 
  AND token = '3TguDFAYuoJ+jFtTxTRWNxyR4w35/4HdLFdiCFtcRqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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