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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ee27a09c36e48981f8267e965457a28c7b18f2eba3163bb9cf074fbbc01aae' 
  AND token = 'ulYHkvPufoWuTHfEMblZxDMkqVMz9wDrDro8b7b8HWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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