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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3dabc1ef7c76760812620955492d73a13b119bc58e3f0757650bc9c0aa28f6b' 
  AND token = '+AGbDuX6+/OrIVvXik0m6zmMoFsFH329S5iWZfY1iFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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