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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3069fe48c8caadadd70a64038443108a296553c67468a763986092a8e64408f' 
  AND token = 'BePl+6D3k+v6+yE/xufgN40FyKRfU2x1S599Oi1lvZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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