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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35988755711b5282e8f5946dddb25e615cedddccaa731144e8ba2e612da17650' 
  AND token = 'RUp0CwvC115MaV2knwz0O9ZUY5ruQcaDvVK48bzjExM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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