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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a26404363b6553f8a21671f400693d2a29ec0825d2bb7c8497ebbbcec9f79f' 
  AND token = 'xuP+dIf7+J8bBq6ADpRwu2K+XAwUmitb8z22dabXCto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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