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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510e289fd561295b51f114c3a8741c1cd7505b1037bd0235e7f9b029d7373b1f' 
  AND token = 'Vk5yLSzCb6QsS7/dA43L7aP9FAh5ZH5otTdKupOCT4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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