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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7614be0eb90735a055aab8e0f8c0de644919c8a4161aa3c9bfc3ca04d1e382bf' 
  AND token = 'qR1QBlH1TpEuxLTsTpT9JBBbZK/FFmE2eALocnl5QKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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