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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7631df3f41642ad52ad9fd13b2732579cbc2fc2ad1d53ae110c3a018fd3468' 
  AND token = 'jNXWpJhYXmz1Cg2/Z8cRu36qtO6rlJWc18dkH4aA4A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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