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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356f6d7f40df730397cf29a247332f7ef5b877f21a43409773a27ea97b57e9e3' 
  AND token = 'U6uc7cmPu1VHCsFD7oTXJf2HUzhTD4AiW9lvKY5tbFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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