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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c761bf232a6ac735d11c608a98b814b19086d608ed14851c018417d6761ed4d' 
  AND token = 'SSbK/eu/1LFlWF5LOaEEyEGHFwO6n+nasGhezj8Pftc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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