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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978ab172a475e50fe274cbff10cc477be89cb5cfa8f5e594d6079427c5c851d1' 
  AND token = '19+YObBmFuaemlAJrBf7nwKlplzrmTiChphtFgYCiW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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