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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5099111906a0c7386c317bea639ff9658f1c7a342d6c93bc7679ad6556e08160' 
  AND token = 'I1t8PfVdywZJYHs1ALDDQzvGxxRMmF2RV85idu44QK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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