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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b179a814df25b0f8a9f00bd3f65fe45a7781c4712d726964702651d15ec42ee' 
  AND token = '7FEaDluX0JbKHqQ6sC8g8zjwf+ikc+7eSOXPb/qSUwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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