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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd4e832d7a207829ee5fe81caed4f82701ac9c39ea46cfede50e0bf14030b75' 
  AND token = 'FQmiOmxR4fcaVo6iK01drxEpNLQW/eSGUpV1manBAkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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