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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93379c4e743bdb0551af8e57f7385ef067b9006fb49f005f3c8df1eff4c04d54' 
  AND token = 'rvaa4EuETq9NrMH17tt0NAdywAFiqMQivHhXxj52mrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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