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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113885e394be86fe252246167ea55b58ef6c7a804881c5b9bb75d8bb61a204fa' 
  AND token = 'PguWyorHLEVV6k3YZuJ8966Pe/e8juvTz5NS6Gwqong=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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