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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9a6c1a2c031d043105cf4143b755b84424de361a283c957e6ea13d6e7d48c3' 
  AND token = 'Twl+XoEIlf0G45dooQswB4aUhr/PMJgnLNK9zkMVtJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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