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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '449724e3ecfe883d97cc0c8a7a68f7f73fb9fadd69b7e38644800cb31621b877' 
  AND token = 'AvvLWb0bMb0z3hP1etW94mSxGUDPbXn+zMF81/mO50o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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