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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5652aa36d91b3ec8771f4477d82072618cd5580779c6d87d88bdbe6403a234f2' 
  AND token = 'y0fIRQJhshr9by+6qaGVejbhejV3zJ75w7Z4ZEaptgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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