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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae9b637a2b0c814d942adc2eeabc64909f184fbc870eb19351c3e236f1b2e28' 
  AND token = 'kEgLUgPuhx3p5OjUjuz8gufOqMeF3K47166mEhsu2J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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