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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a281afcec17ad377f2df2a66e53801b242e05b5e9e70af88e6425f5896d1aae7' 
  AND token = '78HM0fYkvAT1+PUinw2yfc/epWawnjLRA96Et7uUdbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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