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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ee6736d394e81c2b1b50f35ca2430c9b1bbc6a4b664ec021fca307b7e7066e' 
  AND token = '48OgioQu4HfX+lw/6QCQ4FFdcCSQVQY8nw3u/4z2KYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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