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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518b6ee43857a925872a3e8a63847e324aaf872505977e231c6cc0b0b6c2ea7b' 
  AND token = 'FUCn81Pcqr5HR6wC9neieN0dToqukZ6VIVDuP88p3EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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