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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9248a5c1fa064063d63437fa16941ca17d6c95c88a4055b11c94ad6c9f0f38a8' 
  AND token = 'SLvllIrPNNyJ4V0Chwt5b5w9K1r1x1+4yZsvF7gbWdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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