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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f305ddf17ce6b93336c35e1cd81960e4c3ef25114f52c0ab38ba90309780a1' 
  AND token = 'bcoxCmwmgnrGiSsI199OQbztOf7hYDpA+mLSsKM19KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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