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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fd240ec78be429270569b89403f56a94bfbc224b77940f168020f7acc6d113' 
  AND token = 'Cazr2D6H3yGXqX1xHiypu90L+Ko7XynazJ0lp8aUqCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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