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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789da89d28795d7bc5aa7fd2aa38ce555efafee08389125d5fd2c696bce22c0e' 
  AND token = '8mgzOAiMv9bSApJGcaY6R+hbz005j6hJBwND/28f8bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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