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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd50605a7bf039e9c4a37c78d7c45640b05c361208cdd3def3ef1c3e9c7ee434' 
  AND token = 'Ah2giyVul+pgQ6G01dgrlKQkTFrwT/rAEzlchup1+i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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